CN212404599U - Steel cord and tire - Google Patents
Steel cord and tire Download PDFInfo
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- CN212404599U CN212404599U CN202020729726.XU CN202020729726U CN212404599U CN 212404599 U CN212404599 U CN 212404599U CN 202020729726 U CN202020729726 U CN 202020729726U CN 212404599 U CN212404599 U CN 212404599U
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- steel cord
- convex curve
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Abstract
The utility model discloses a steel cord and tire, the steel cord contains at least one strength element, strength element has periodic discontinuous convex curve, one side or both sides or the multilateral of steel cord are always arranged in to convex curve. The steel cord has a small stiffness at one side or both sides or more sides having the convex curve due to more gaps and openness, and the steel cord has a large stiffness at the other side, thereby imparting orientation to the steel cord. Meanwhile, the convex curve can increase the gap between the strength elements forming the steel cord, improve the rubber permeability of the steel cord, reduce the abrasion of the strength elements and improve the corrosion resistance of the strength elements.
Description
Technical Field
The utility model belongs to the technical field of the rubber products, in particular to steel cord and tire.
Background
The tire has a requirement for orientation of the steel cord with the belt layer during running, and it is desired that the steel cord be reduced in rigidity and increased in flexibility in the tire radial direction so as to be easily capable of crossing obstacles such as cobblestones with good ride comfort; it is desirable that the steel cord has increased rigidity and decreased flexibility in the tire axial direction, so that it is more stable in bending and has good steering performance. In general, a steel cord is always isotropic in a manufacturing process, and a steel cord having an orientation needs to be processed and manufactured in a special manner.
EP0264145a1 discloses a steel cord with an elongated cross section comprising flat steel wires as core. CN102482844B discloses a steel cord with an oval cross section comprising oval steel wires as core. The elongated cross section or the elliptical cross section allows the steel cord to be obtained with orientation, but the flat wire or the elliptical wire decreases mechanical properties of the wire during the manufacturing process, such as fatigue resistance and tensile strength, and the flat wire or the elliptical wire is manufactured by cold drawing using a forming die or by cold rolling, which is complicated and difficult in the manufacturing process and increases the production cost.
JP- ｃA-09-268485 discloses another method of manufacturing an oriented steel cord by arranging round steel filaments according to an elliptical geometric feature, but the process of manufacturing the steel cord is not easy to implement and the cost is high.
SUMMERY OF THE UTILITY MODEL
The purpose is as follows: in order to overcome the defects existing in the prior art, the utility model provides a steel cord and tire.
The technical scheme is as follows: in order to solve the technical problem, the utility model discloses a technical scheme does:
a steel cord comprising at least one strength element having a periodic discontinuous convex curve, which is always placed on one or two or more sides of the steel cord.
In the present application, the term "steel cord" does not mean that all the constituent elements are steel elements, but only that most of them are steel elements. Other elements such as nylon or aromatic polyester amine elements or other materials may also be present as strength elements or filler elements in the steel cord.
The term "element" may refer to a single steel wire or a strand having a plurality of single steel wires.
Preferably, the ratio C/P of the periodic distance C of the discontinuous convex curve of the strength element to the twisting lay length P of the strength element at the twisting position of the steel cord is less than or equal to 1.
Preferably, the ratio L/C of the length L of the convex curve to the periodic distance C of the discontinuous convex curve of the strength member is less than or equal to 0.5.
The periodic distance C of the discontinuous convex curve of a strength element refers to the axial distance from the convex curve home position of an individual strength element to the next adjacent convex curve home position.
The length L of the convex curve refers to the axial distance from the initial position to the end position of the convex curve.
The twist position refers to the position where the strength elements are arranged in the steel cord.
Preferably, the ratio of the wave height H of the convex curve to the diameter d of the strength element is 1.02-2.50, and the convex curve has a plurality of wavelengths. Further, in some embodiments, the convex curve has 2-4 wavelengths.
The wave height H of the convex curve refers to the distance from the crest to the trough of the convex curve perpendicular to the axial direction of the element.
Wavelength refers to the axial distance between adjacent peaks (or valleys).
The difference in orientation of the steel cord cannot be exhibited significantly if the ratio of the wave height H of the convex curve to the strength member diameter d is less than 1.02; a ratio of the wave height H of the convex curve to the strength member diameter d of more than 2.50 results in a significant increase in the strength loss of the strength member.
Preferably, all the strength elements constituting the same twist position of the steel cord have a periodic discontinuous convex curve, and said convex curve is always placed on one or both or more sides of the steel cord.
Preferably, said convex curve is always placed on both symmetrical sides of the steel cord. More preferably, the ratio of the periodic distance C of the discontinuous convex curve of the strength element to the twist lay length P of the strength element at the twist position of the steel cord is C/P0.5, and the ratio of the length L of the convex curve to the periodic distance C of the discontinuous convex curve of the strength element is L/C0.5.
Preferably, the periodic discontinuous convex curve of the strength members is in a plane.
Preferably, the periodic discontinuous convex curve of the strength members is within a continuous curve.
The diameter of the strength member is generally 0.10mm to 0.80mm, and other diameters may be designed as necessary.
In the case of a strength member as a steel member, the carbon content is generally 0.60% to 1.02% in order to obtain a high strength.
The strength member may be a bare steel wire or a coated steel wire without any coating. Preferably, to improve the adhesion of the steel cord to the rubber, the strength members are coated with a brass or other metal alloy coating that promotes adhesion to the rubber.
The utility model also discloses a manufacturing method of foretell steel cord, include:
-subjecting at least one of said elements to a periodic discontinuous bending operation so that said at least one element has a periodic discontinuous convex curve;
-making up said steel cord with at least one of said elements, along with the other elements, said elements subjected to periodic discontinuous bending operations having periodic discontinuous convex curves periodically placed on one or both or more sides of the steel cord during the making up.
Preferably, the periodic discontinuous bending operation received by at least one of the strength members is performed in a plane.
Preferably, the periodic discontinuous bending operation to which at least one of the strength members is subjected is performed in a helical manner.
The utility model also discloses a tire, including foretell steel cord.
Has the advantages that: the utility model provides a steel cord and tire, steel cord has orientation, steel cord is having convex curve one side or both sides or multilateral lead to its rigidity little owing to have more clearance and aperture, and steel cord is big in the rigidity of other sides. The steel cord is arranged in the tire belt layer according to the orientation of the rigidity, the side with low rigidity is arranged in the radial direction of the tire, and the side with high rigidity is arranged in the axial direction of the tire, so that good comfort and steering of driving are realized. In addition, the convex curve may increase the gap between the strength members constituting the steel cord, thereby improving the rubber permeability of the steel cord, reducing the abrasion of the strength members, and improving the corrosion resistance of the strength members.
Drawings
Fig. 1 is a schematic structural view of a prior art steel cord: a conventional steel cord 10, a first element 11, a second element 12.
Fig. 2 is a schematic view of a strength member according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a steel cord of an embodiment of the present invention: a steel cord 20, a first strength member 21, a second strength member 22.
Fig. 4 is a schematic view of a double twister for manufacturing a steel cord of an embodiment of the present invention.
FIG. 5 is a schematic view of a male gear in an embodiment.
In fig. 4 and 5: steel cord 20, strength component 30, original strength component 40, paying-off I-shaped wheel 41, convex gear 42, double-twisting machine 43, over-twisting device 44 and take-up spool 45.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may also include different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
A method of manufacturing an oriented steel cord comprising:
-subjecting at least one of said elements to a periodic discontinuous bending operation so that said at least one element has a periodic discontinuous convex curve;
-making up said steel cord with at least one of said elements, along with the other elements, said elements subjected to periodic discontinuous bending operations having periodic discontinuous convex curves periodically placed on one or both or more sides of the steel cord during the making up.
The strength member may be subjected to periodic, discontinuous bending operations using the male gear 42 shown in fig. 5, with the male teeth of the male gear 42 being in a periodic, discontinuous arrangement, so that a strength member 30 as shown in fig. 2 may be obtained. The required wave height H of the strength element 30, the length L of the convex curve and the periodic distance C of the convex curve can be obtained by designing and adjusting the wheel diameter, the tooth number and the tooth number of the convex gear 42, and meanwhile, a plurality of wavelengths of the convex curve of the strength element 30 can be set according to the tooth shape of the convex gear 42.
The male gear 42 may be actively rotated to bend the strength members or passively rotated to bend the strength members.
The male gear 42 may perform a bending operation on the strength member in one plane, and may also perform a bending operation on the strength member in a spiral manner by rotating the strength member around the axial direction thereof.
The male gear is only one way of bending the strength member, and other ways of periodically deforming the strength member by deforming rollers, bearings, etc. may be used.
As shown in fig. 4, a green strength member 40 is paid off from a pay-off reel 41, past a male gear 42, to obtain a strength member 30 having a periodic, discontinuous male curve. When the strength members 30 are twisted into the steel cord 20 by the double twister 43, the strength members 30 constitute the steel cord 20 in a nearly spiral manner, and the strength members 30 themselves are twisted centering on the axial direction of the steel cord 20, and the strength members 30 are twisted by one turn each time a pitch is formed. Adjusting the deformation position of the male gear 42, arranging each strength member 30 in a convex curve in order to make the position of the spiral winding of the convex curve of the twisted strength member 30 be periodically arranged on one side or two sides or more sides of the steel cord 20, and finally taking up the steel cord by the take-up spool 45, thereby obtaining the steel cord with orientation of the embodiment of the present invention, as shown in fig. 3.
Example 1
Example 1 a periodic discontinuous bending operation is performed through a male gear using a raw strength member having a diameter of 0.30mm, and since the bending operation may reduce the breaking load of the strength member to some extent, in the process of manufacturing the strength member having a diameter of 0.30mm, the initial strength of the strength member before the bending operation is appropriately increased to maintain the breaking load of the finally manufactured steel cord at a good level, which may be obtained by increasing the drawing strain or increasing the tensile strength of the drawn strength steel wire, etc., which is a common way for those skilled in the art. The periodic distance of the convex curve of the intensity element of 0.30mm is 7.00mm, the length of the convex curve is 3.50mm, the wave height is 0.37mm, and the wavelength is 1.40 mm. The convex curve positions of two 0.30mm strength members were arranged in order, and twisted to obtain a steel cord of 2X 0.30 structure, with a twist pitch of 14.00mm, as shown in FIG. 3.
For a prior art steel cord 2 x 0.30 manufactured in the same structure, as shown in fig. 1, the present example and the comparative example of the prior art were subjected to a comparative test, and the test results are shown in table 1.
TABLE 1
As can be seen from table 1, there is no difference between the major axis and the minor axis, nor is there any difference in the stiffness along the minor axis and the stiffness along the major axis for comparative example 1. However, with this example 1, there is a large difference between the stiffness along the minor axis and the stiffness along the major axis, with better performance than with comparative example 1. The air retention under vulcanization conditions is a test mode of rubber permeability, the higher the air retention (up to 1) is, the better the rubber permeability is, and the steel cords of comparative example 1 and example 1 both have better rubber permeability.
Example 2
Example 2 periodic discontinuous bending operations were carried out through a male gear using a strength member having a diameter of 0.25mm, and since the bending operations would reduce the breaking load of the strength member to some extent, during the manufacture of the 0.25mm strength member, the initial strength of the strength member before the bending operations was suitably increased to maintain the breaking load of the finally manufactured steel cord at a good level, which can be obtained by increasing the drawing strain or increasing the tensile strength of the drawn strength steel wire, etc., which is a common way for those skilled in the art. The periodic distance of the convex curve of the intensity element of 0.25mm is 6.00mm, the length of the convex curve is 1.50mm, the wave height is 0.30mm, and the wavelength is 0.43 mm. The convex curve positions of 4 strength members of 0.25mm were arranged in order, and a steel cord of 4 × 0.25 structure was twisted with a twist pitch of 12.00mm as shown in fig. 3.
For the prior art steel cord 4 × 0.25 manufactured in the same structure, as shown in fig. 1, the present example and the comparative example of the prior art were subjected to a comparative test, and the test results are shown in table 2.
TABLE 2
As can be seen from table 2, for comparative example 2, there was no difference between the major axis and the minor axis, nor was there any difference in the stiffness along the minor axis and the stiffness along the major axis. However, with this example 2, there is a large difference between the stiffness along the minor axis and the stiffness along the major axis, with better performance than with comparative example 2. The air retention under vulcanization conditions of comparative example 2 was better than that of example 2, indicating that example 2 had better rubber permeability.
In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered limiting with respect to the scope of the present invention.
The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.
Claims (10)
1. A steel cord characterized by: the steel cord comprises at least one strength element having a periodic discontinuous convex curve, which is always placed on one or both or more sides of the steel cord.
2. A steel cord as claimed in claim 1, characterized in that: the ratio C/P of the periodic distance C of the discontinuous convex curve of the strength element to the twisting lay length P of the strength element at the twisting position of the steel cord is less than or equal to 1.
3. A steel cord as claimed in claim 1, characterized in that: the ratio L/C of the length L of the convex curve to the periodic distance C of the discontinuous convex curve of the strength member is less than or equal to 0.5.
4. A steel cord as claimed in claim 1, characterized in that: the ratio of the wave height H of the convex curve to the diameter d of the strength element is 1.02-2.50, and the convex curve has a plurality of wavelengths.
5. A steel cord as claimed in claim 1, characterized in that: all the strength elements constituting the same twist position of the steel cord have a periodic discontinuous convex curve and said convex curve is always placed on one or both or more sides of the steel cord.
6. A steel cord according to claim 5, characterized in that: said convex curve is always placed on both symmetrical sides of the steel cord.
7. A steel cord according to claim 6, characterized in that: the ratio of the periodic distance C of the discontinuous convex curve of the strength element to the twisting lay length P of the strength element at the twisting position of the steel cord is C/P =0.5, and the ratio L/C of the length L of the convex curve to the periodic distance C of the discontinuous convex curve of the strength element is less than or equal to 0.5.
8. A steel cord according to any one of claims 1 to 7, characterized in that: the periodic discontinuous convex curve of the strength members is in a plane.
9. A steel cord according to any one of claims 1 to 7, characterized in that: the periodic discontinuous convex curve of the strength members is within a continuous curve.
10. A tire, characterized by: comprising a steel cord according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020729726.XU CN212404599U (en) | 2020-05-07 | 2020-05-07 | Steel cord and tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020729726.XU CN212404599U (en) | 2020-05-07 | 2020-05-07 | Steel cord and tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212404599U true CN212404599U (en) | 2021-01-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020729726.XU Active CN212404599U (en) | 2020-05-07 | 2020-05-07 | Steel cord and tire |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212404599U (en) |
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2020
- 2020-05-07 CN CN202020729726.XU patent/CN212404599U/en active Active
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